Soluble protein compound obtained from fish and process of making the same.



To all whom, it may concern R'ETDULF ADLER, OF AMSTERDAM, NETHERLANDS, ASSIGNOR- TO NAAMLOOZE VEN- NOOTSCHAP ALGEMEENE UITVINDING EXPLOITATIE MAA'ISCHAPPIJ, OF AMSTER- DAM, NETHERLANDS.

SOLUBLE PROTEIN commune na rative]: FROM itnnraoonss or MAKING THE "SAME! No Drawing Be it known that I, iRUnOLF ADLER, a chemist and a doctor of philosophy, a subject of the Emperor of Austria-Hungary, and a resident of 4:6 Amsteldijk, in the city of Amsterdam, Netherlands, have invented a new and useful Soluble Protein Compound Obtained from Fish and Processes of Maliing the Same, of which the following is a specification.

The manufacture of soluble protein compounds from meat or animal flesh is generally done in such way that meat is treated with water in the presence or absence of alkalis or acids, and subjected to an elevated temperature. This process which is gener ally in use has the great disadvantage, that on the onehand owing to the application of an elevated temperature a fat-reaching splitting up of the protein into peptone like, low broken up substances takes place, and that, on the otherjiand when heatingthe protein in an alkaline solution a formation ofnnelanins or melanoidins occurs. The presence of peptone-like substances in the protein preparation has as a consequence, that the product has a relatively low nutritive value, whereas, the presence of mela nins and melanoidins on the one hand gives to the preparation a-more or less dark color, and on the other hand owing to the poisonous properties of these substances, makes its use as human aliment questionable.

The present invention has for its object to obviate these (jlrawbacks. it has been found that fish flesh can be transformed smoothly into soluble colorless, inodorous protein sul'istances consisting for the largrer part of proteoses, if the fish. flesh previously wcll. boiled out and aitmwvard well-Washed with hot- Water is stirred in a disintegrated state with a thick lime sludge and it the mixture thus obtained is alhrwcd to ren'lain for some time while moderately stirring the same. Now it after the hydrolysis is as com plctc as possible, the sludnc is copiously dilutcd with water and thereafter in order to precipitate the (rah-inn hydratq carbonic acid is passed into thc mass, a lter filtering a complclcly colorless solution of the protein compounds is obtained, which. is then owqioralcd in the usual manner in a vacu- Specifieatiqn of Letters Patent, l Patented June '33, 19141. Application filed October 2, 1913. Seria1No.-792,96.

um. In order to completely separate the calcium carbonate it is of advantage to eiiect the passing in of the carbon dioxid in the presence of a small amount of ammonia under heat. l

The way of carrying out the process can be explained by means of the following example: 100 kilos of fish, the intestines of which. have been removed, are boiled in \vator .for two to three hours, after this they are separated from the broth, and Well washed out with hot Water. The residue which, if desired, can be pressed out is ground with. lime sludge (about 10 kilos of alcium oxid clogged to a thick sludge) in a mill and left standing for 48 hours While moderately stirring. By testing small test tube samples the progress of the process can be controlled, and as soon the la rgest possible quantity of soluble protein has been formed the further working; up can be pro cceded with. After hydrolysis, the liquid is diluted with 500 liters of Water and after the addition of 500 c. c. of ammonia solution (40 per cent.) carbon dioxid is passed into the liquid until the calcium carbonate has been precipitated. The mass is now quickly heated to boiling tem 'ieratnre in order to more easily separate the calcium carbonate and is pressed out in a filtcrpless. The almost colorless filtrate is concentrated in a high vacuum to a syrupy consistency and this is completely freed from its water:

contents in a vacuum drying apparatus.

The soluble protein compound formed by the above process is of great purity tree from peptone-li-ke substanccs, melanins or mehinoidins, is almost tasteless, forms a colorless liquid. when dissolved in water, and possesses slight hygroscopic properties.

I claiml. A process for the nnmufacture of soluble protein compounds from fish in which fish which has been well boiled out and lixivatcd with hot water is left standing for some time at normal temperature while moderately stirring with a sludge oi calcium hydrate dilutcd with water after hydrolizinc", thereupon carbon dioxid is passed into lho liquid until the calcium carbonate has l'ccn conmlclcly prccipitatml, if desired, with the addition of a'umionia solution and application of heat, the filtrate being evapvacuum.

2. A soluble protein compound which is of great purity, free from peptone-like substances, melanins or melanoidins, is almost tasteless, forms a oolorless liquid when diasolved in water, ,and possesses slight hygr o o rated to dryness in the usual manner in a scopic properties. v-

I RI IDOLF ADLER. Witnesses: 4

Wowmmn HAUP'r,

I'IENPY HAsPER. 

